Oh and from the looks of the very brief shot of it Cap#s new shield isn't a replica of his original but some thing, more triangular and high tech.

African tribes have been making shields for centuries. While most are large ovals, they so have some smaller leaf-shaped shields. They also have small "buckler" shields that attach to the arm, instead of being held in the off-hand. So it's not that big a jump to make a leaf or triangular shield for Cap.

Librium Arcana, Where Gamers Play!
Nitram, slightly high on cough syrup: Do you know you're beautiful?
Me: Nope, that's why I have you around to tell me.
Nitram: You -are- beautiful. Anyone tries to tell you otherwise kill them."A life is like a garden. Perfect moments can be had, but not preserved, except in memory. LLAP" -- Leonard Nimoy, last Tweet